Hello, thank you both for your expressed interest for C/C++ support in SonarLint for VSCode!
TL;DR: C/C++ support in SonarLint for VSCode is not on the short term roadmap.
The current SonarLint roadmap concentrates on providing the best UX possible to the most frequent IDE/language couples we notice in the wild - e.g: IntelliJ/Java, Eclipse/Java, VS/C#, VS/C/C++, VSCode/JS/TS, VSCode/Python.
In a perfect world given unlimited development and support bandwidth, we would love to support every language in every IDE - and in the real world with limited bandwidth, we chose to give priority to the largest audiences we identified among our users - which also means that priorities can shift if we notice that a IDE/language couple is gaining traction.
This being said, we are (shameless plug) expanding the SonarLint team which means we should soon have more bandwidth to support more languages! And we indeed noticed that VS Code is becoming a very popular IDE for a wide range of technologies, including C and C++.